| http://www.w3.org/ns/prov#value | - The four lesions together can form a lesion 48 around the pulmonary veins, for example. [0064] In another aspect of the invention, the instruments of the present invention are particularly useful in forming lesions around the pulmonary veins by directing radiation towards the epicardial surface of the heart and the loop configuration of distal end portion of the instruments facilitates such use.
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